Cant find device AE21

Experts,

I have set up link aggregation AE21: 

aggregated-ether-options {
lacp {
active;
periodic fast;
}
}
unit 0 {
family ethernet-switching {
interface-mode trunk;
vlan {
members all;
}
}
}

added port ge-2/0/21 & ge-2/0/22 but when I do sh int ae21 it says error: device ae21 not found however:

run show interfaces terse | match ae21 :
ge-2/0/21.0 up up aenet --> ae21.0
ge-2/0/22.0 up up aenet --> ae21.0

and:

ae20 up up 
ae21   ?   ?

I am missing something I know